Bit-recovering means



J. P. T. DAVIS.

BlT RECOVERING MEANS.

APPLICATION FILED SEPT. 15. 1919.

1 Patented Nov. 8, 1921.

2 SHEETS-SHEET I.

J. P. T. DAVIS.

BIT RECOVERING MEANS.

APPLICATION FILED SEPT. 15. 1919.

Patented Nov. 8, 1921.

2 SHEETSSHEET 2.

UNITED STATES J OHN P. T. DAVIS, OF ELK CITY, KANSAS.

iarr-anoovnamo MEANS.

T all whom it may concern:

- Be it knownthat I, JOHN P. 'I. DAVIS, a citizen of the United States,residing at Elk City, in. the county of Montgomery and State of-Kansas,have invented certainnew and useful Improvements in BitRecovering Means;and I do declare the following to be a full, clear, and eXac descriptionof the invention, such as will enable others skilled in the arttO'WlllCh it appertains to make and use the same.

My invention relates to well drilling and acre particularly to devicesfor recovering drill bits from a well in case the latter is caved inabove the bit, and the principal object of my invention is to provide anovel arrangement of'parts whereby such recovery of the bit may beeffected without the necessity of cutting'thecable to which the bit isattached.

With the foregoing in view, the invention resides in the novelconstruction and arrangement of parts hereinafter described and claimed,the descriptive matter being supplemented by the accompanying drawingsforming part of this application.

Figure 1 is a side elevation of a portion of a well drilling rig showingthe bit of the present invention in use for pulverizing the earth whichhas caved in over the well drilling tool.

Fig. 2 is a view similar to Fig. 1 illustrating-the bailer in use toremove the earth, rock, etc, pulverized by the bit above mentioned.

Fig. 3 isa perspective view of the pulverizing bit and the guide onwhich it operates.

Fig. st is a horizontal section on the plane e %4 of Fig. 3.

5 is a vertical section of the bit. 6 is a sectional perspective view oft guide' 7 is a perspective view of the bailer. 8 is a horizontalsection on the plane of line 88 of Fig. '7.

In the drawings above briefly described, I have'showna portion of a welldrilling rig It which includes a derrick frame D, cable C depending fromsaid frame and carrying a drill bit T, a walking beam W and a suitableclamp 0 carried by the walking beam for attachment to the sand line Lwhen it is desired to operate my improved bit during Specification ofLetters Patent.

Patented Nov. 8, 1921.

Application-filed September 15, 1919. Serial No. 323,803.

the operation oflrecovering a lost drilling tool.

1 In carrying out my invention, I employ a vertically elongated drillingbit 1 formed of two vertical sections'having channels 2 in their innersides, said sections being shown hinged together at 3, whereby they maybe either closed directly around the cable C or around a tubular guide4: which preferably surrounds said cable. It thus follows that whenthesand line L is attached to the bit 1 andlowered into the well,operation of the walking beam WV- will vertically reciprocate said bitand thus caved inf material 1 above the losttool T maybe pulverizedsufliciently for the greater part-offsuchmaterial to be held insuspension in the water around the cave in. After thispulverizing; isaccomplished, the bitlis removed and a bailer 5 is operated by the sandline L to remove all of the pulverized material.

The bit 1 is by preference pointed at its lower end as indicated at 6and I have shown the upper ends of its two sections provided with lugs 7in which the lower ends of open links 8 are pivoted. A cross arm 9 abovethe links 8 is provided with hooked ends 10 which extend inwardlythrough the links in question, said cross arm having a central opening11. The lower end of the sand line L is formed into a loop, is passedthrough the opening 11, and hooked over the ends 10 of the cross arm 9,and by this arrangement, the cable is attached to the bit and at thesame time the two hinged sections of said bit are held in closedposition, either direc'tly around the cable C, or around the guide 4.This guide is preferably employed to shield the cable C against wear,the bit moving upon said guide more than the latter shifts upon thecable. The guide in question is of tubular form, constructed of twosections hinged together at 12, a suitable latch 13 being employed tohold said sections closed around the cable. Both ends of guide l areprovided with flanges or other suitable means 14 to prevent movement ofthe bit entirely from said guide, in either direction.

The bailer 5 is preferably of cylindrical form with a vertical channel15 in one side to receive the cable C when said bailer is being raisedand lowered. The bottom of this bailer may be provided with suitableflap valves 16 which open upwardly to allow in the meantime so stirringthe water as to cause the latter to carry a large portion of thepulverized material in suspension. The

bit -1 is raised when its use is no longer needed and the bailer 5 isoperated to bail out the materialand the water previously acted upon bythe hit By operating the device in this manner, the tool T may be recovered without the necessity of cutting the cable C, this being ofgreat importance.

J Since probably the best results may be obtained from the detailsdisclosed, they may wellbe followed, but within the scope of theinvention as claimed, numerous minor changes may well be made.

I claim 1 1. A bit of the herein described class formed'of two verticalsections hinged together and having channels in their inner sides,-andmeans for holding said sections closed around a cable.

2. A bit of the herein described class formed of two vertical sectionshinged together and having channels in their inner sides, open linkspivoted to and rising from the upper ends of said sections, a cross armhaving hooked ends extended inwardly through said links, said cross armhaving a centralopening, and a cable having a looped end passing throughsaid opening and hooked around said ends of said cross arm;

3; A drilling'bit of the class described formed of two vertical sectionshaving vertical channels in their inner-sides, means for holding saidsections'clo'sed with their channels in registration with each other,and a tubular guide slidably received insaid channels, said guide beingformed of tworsec tions having channels to receive a tool carryingcable, means for holding said guide sec tions closed around the cable,and stop means on said guide to prevent removal of said bit from saidguide.- a

In testimony whereof I have hereunto set my hand. 7

' I JOHN P. T. DAVIS. Witnesses J. A; Brown,

BEATRICE WVoRrHrNe'roN.

